Apparatus for making tubing.



No. 808,356. PATBNTED DEC. 26, 1905. N. FOSTER.

APPARATUS FOR MAKING TUBING.

APPLICATION FILED JUNE 10. 1904.

2 SHEETSSHEET 1.

S Mam N0. 808,356. PATENTED DEC. 26, 1905.

N. FOSTER.

APPARATUS FOR MAKING TUBING.

APPLIGATION FILED JUNE 10, 1904.

2 SHEETS-SHEET 2 vwenfoi (lttouwq if UNITED STATES PATENT orrron.

NICHOLAS FOSTER, OF SOUTH TACOMA, WASHINGTON, ASSIGNOR OF ONE-HALF TO JOHN O. JOHNSON.

APPARATUS FOR MAKING TUBING.

Specification of Letters Patent.

Patented Dec. 26, 1905,

Application filed June 10, 1904- Serial No. 212,020.

To aZZ whom it may concern:

Be it known that I, NIoHoLAs FOSTER, a naturalized citizen of the United States, residing at South Tacoma, in the county of Pierce and State of WVashington, have invented certain new and useful Improvements in Apparatus for Making Tubing; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in apparatus for making roll-drawn tubing.

The object of the present invention is to provide an improved apparatus for the construction of boiler-flues or the like from solid billets or ingots of steel or iron.

Another object of the invention is to construct an apparatus which will roll the material employed in the construction of a tube without tearing the fiber, but, on the contrary, will make it compact and solid.

A still further object of the invention is to provide a plurality of pairs of grooved rolls in such position as will cause the axes of each pair of rolls to lie in a plane at right angles to the adjacent pair and permit of the grooves to register with the common central opening formed by all of the rolls employed in the apparatus.

With these and other objects in view the invention consists in certain other novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described, illustrated in the accompanying drawings, and more particularly pointed out in the claims hereto appended.

In the drawings, Figure 1 is a view in side elevation of an apparatus constructed in accordance with the present invention. Fig. 2 is an elevated front view of the apparatus. Fig. 3 is an elevated end view of the apparatus. Fig. 4 is an elevated fragmentary end view of the forward portion of an apparatus constructed in accordance with the present invention. Fig. 5 is a view in side elevation of a mandrel or ram upon one end of which is mounted a blank or ingot, said blank and mandrel being shown in proper position for the insertion thereof between the first pair of rolls and subsequently between the succeeding pairs.

In carrying out the present invention I have under contemplation an apparatus for forming the tubes, as hereinafter specifically described, by forcing the ingot through the machine upon the mandrel by any suitable means, preferably a hydraulic ram, so as to permit of rotation of the rolls in the direction of the feeding of said ingot and mandrel. It is further contemplated to provide each roll with a narrow wearing-surface, whereby the durability and efficiency in the construction and operation of the apparatus are materially increased. I have also produced a frame which comprises flat parallel members, each member provided with a web or reinforcing means extending its entire length, producing an approximately T-shaped structure, and means for removably securing said members together.

Referring to the drawings, each pair of rolls are alternately arranged in horizontal and vertical positions. The vertical pair of idle rolls 1 1 are journaled inboxes 2 2. The horizontal pair of idle rolls 3 3 are journaled in vertical boxes 4, preferably constructed similarly to boxes 2 2. Each roll employed in the construction of the apparatus is provided with comparatively narrow Wearing-surfaces- 5, which materially increases the durability of the rolls for the reason that by means of such construction there is not exposed a wearing-surface of comparatively great width The groove which is formed upon each roll is of the same contour and depth in each instance for the purpose of providing a central opening of the same diameter throughout the entire length of the apparatus.

For the purpose of retaining the rolls in a positive assembled position the journal-boxes 2 are mounted between a plurality of approximately T-shaped beams 6 6. The beams 6 6 are secured to the boxes 2 and 4 by any suitable means, preferably set-screws 7, passing through the engaging portion of each T shaped beam and into the journal-boxes 2 and 4. For the purpose of facilitating the assembling and the disassembling of the apparatus screws 7 or similar means are remov ably mounted upon beams 6 6 and the respective journalboxes. For assisting the setscrews in retaining the parts in a fixed position I also employ at the ends of each beam and near the corner thereof a plurality of connecting-bars 8, WhlOll are removably mounted upon sald beams.

Referring to Fig. 1, it will be apparent that the lower T-shaped beam 6 is mounted upon a stone or brick foundation, which materially assists in the rigidity of each of the ournalboxes which are employed in the construction of a completed apparatus. Upon the mandrel 9 a blank or ingot is placed, and subsequently said ingot and mandrel are inserted between the horizontal rolls, mounted upon the front of the apparatus, and by driving the mandrel through the registering grooves of the different pairs of rolls by any suitable means, preferably a hydraulic ram, the different rolls will be rotated in the direction of movement of the ingot and mandrel, thereby permitting of the metal to be drawn out on the mandrel, which forms the core for the boiler-flue, permitting of said flue to leave the rolls in. a heated condition and not a single fiber broken.

By positioning each pair of grooved rolls alternately in horizontal and vertical positions it will be obvious that there is exerted upon the ingot an even pressure throughout the length of the apparatus without causing any unevenness on the outer or inner surface of the flue. If the rolls are well journaled in boxes lying in the same plane, it would necessarily follow that the grooved surface of each roll would be exerting a pressure upon the flue in approximately the same position as the next adjacent roll lying upon the same side of the apparatus. By the arrangement of a pair of rolls in a horizontal position and the next adjacent pair in a vertical position one of said pairs of rolls will produce the greatest pressure at diagrammatically opposite points of the flue, while the next adjacent set will exert a pressure upon the tube at diagrammatically opposite points at right angles to the preceding points of pressure of the first pair of rolls. Of course it will be obvious that the entire grooved surface of each roll will tend to draw the metal, but that the greatest pressure will be at the center of the groove formed upon each roll.

From the foregoing description it will be obvious that by forcing the blank through the alternately-positioned drawing-rolls, by means of driving the ram or mandrel through the rolls, while the operation and construction of the apparatus is simple, the tubes manufactured in a machine constructed according to the present invention will be of superior density and toughness, as the drawing-rolls will not break or injure any of the fibers of the blank. By driving the mandrel upon which the blank is mounted through the machine, thereby causing each set of rolls to be rotated in the same direction, the capacity of an apparatus is materially in creased, with the additional advantage of imprpving the quality of the constructed art1c e.

While I have described in the foregoing description and illustrated in the accompanying drawings the preferred form of my invention, it will be obvious to one versed in the art to which this invention relates that certain alterations, modifications, and changes may be made, and I therefore reserve the right to make such alterations, modifications, and changes as shall fairly fall within the spirit and scope of the present invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A mechanism of the class described, comprising a pair of approximately T-shaped beams, removable bolts secured upon and connecting each corner of said beams, a plurality of pairs of boxes mounted upon said beams, each box of the same length as the width of said T-shaped beams, and grooved rolls ournaled on each pair of said boxes.

2. In a mechanism of the class described, the combination of parallel, approximately T-shaped beams, removable parallel members secured upon each end and connecting said beams, a plurality of pairs of vertical and horizontal boxes of the same length as the width of and removably mounted upon said beams, and rolls journaled in said boxes.

3. In a device of the character described, the combination of a plurality of parallel members, each member provided with a central, longitudinal Web extending throughout its entire length, removable, parallel pairs of boxes of the same length as the Width of said members, positioned between the same, rolls carried by said boxes, and means removably securing said boxes and members together.

4. In a mechanism of the class described, the combination of parallel members, ver tical and horizontal boxes positioned between said members, said boxes of the same length as the width of said members, rolls j ournaled in said boxes, and means for positively securing said members and boxes together.

5. In a mechanism of the class described, the combination of a frame, comprising parallel members, boxes interposed between said members of the same length as the width of the same, and revoluble, pressure-exerting means j ournaled in said boxes.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

NICHOLAS FOSTER.

Witnesses:

D. H. WHITE, J. W. DIGNAN.

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